Felix I just the buy the cross lock snaps made by Berkley. They come in a few different size strengths. I use the heaviest except on my jerkbait rod when I'll use the light ones. I have never bent or broke a snap although I have heard horror stories. You should be able to find them at your local wal mart

I have a couple packages of the Norman speed clips but I don't really care for them. They perform great I just like the Berkely cross locks better

I'm both hot and and cold on snaps like a duolock.  I use them all time in freshwater and they are excellent for quick change.  The negative for me is getting a bit lazy and leaving my leader on too many days, that isn't a knock on the lock but on me.  I don't recall any failure with them in both fresh or salt, when the fishing is slow in saltwater I prefer a loopknot, when it's hot I'll use a snap.  I tend to shy away using a snap with a topwater lure.

i use a duo lock snap.  i've used Danielson from TW and some from BPS .  never had a problem with either.  i retie before every outing/tournament and check the knot and a few feet up from it frequently during the day..

if it is really windy i may use a duo lock snap with a swivel to help prevent line twist as much as possible..